Lockheed Martin agrees to purchase Ultra Maritime, a naval defense business focused on anti-submarine warfare capabilities, in a deal valued at about $3.45 billion (reported as roughly $3.5 billion in some coverage). The company behind Ultra Maritime is private equity firm Advent International. Sources describe Ultra Maritime as providing technologies used for submarine detection and counter-submarine operations, including sonar systems, sonobuoys, and torpedo defense technologies. The acquisition is presented as part of Lockheed Martin’s broader push to expand its undersea weapons and sea-based defense offerings as demand for maritime weapons systems rises. Coverage across outlets links the transaction to Lockheed’s interest in strengthening its portfolio for allied navies that operate undersea threat detection and defense requirements. The reports are consistent that Lockheed Martin is the buyer, Advent International is the current owner through its private equity structure, and the transaction amount centers on $3.45 billion. Details on closing timing, regulatory approvals, and any specific integration steps are not included in the provided excerpts.